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Police have arrested another Valley teen for having a gun on school grounds. On February 21, at approximately 7 a.m., before school started, Peoria police arrested an 18-year-old male student at Liberty High School for bringing a gun onto school grounds in his vehicle.

Police have arrested another Valley teen for having a gun on school grounds. On February 21, at approximately 7 a.m., before school started, Peoria police arrested an 18-year-old male student at Liberty High School for bringing a gun onto school grounds in his vehicle.

Authorities said James L. Mason Jr. stabbed his stepfather Alan Nielsen in the chest with a large hunting knife back in 2015. The 72-year-old Nielsen died at a local hospital. Mason, 43, was taken into custody without incident.

Authorities said James L. Mason Jr. stabbed his stepfather Alan Nielsen in the chest with a large hunting knife back in 2015. The 72-year-old Nielsen died at a local hospital. Mason, 43, was taken into custody without incident.